Ios UISegmentedControl setTitleTextAttributes不工作

因此，我尝试更改UISegmentedControl标题的文本属性，但没有效果，没有任何更改。我还应用了自定义背景和分隔符，它工作正常，但不是这个

NSDictionary *normaltextAttr = 
            @{[UIColor blackColor]: UITextAttributeTextColor,
              [UIColor  clearColor]: UITextAttributeTextShadowColor,
              [UIFont fontWithName:_regularFont size:20.f]: UITextAttributeFont};


NSDictionary *selectedtextAttr = 
            @{[UIColor colorWithRed:135.0/255.0 green:135.0/255.0 blue:135.0/255.0 alpha:1.0]: UITextAttributeTextColor,
              [UIColor clearColor]: UITextAttributeTextShadowColor,
              [NSValue valueWithUIOffset:UIOffsetMake(0, 1)]: UITextAttributeTextShadowOffset,
              [UIFont fontWithName:_regularFont size:0.0]: UITextAttributeFont};

[[UISegmentedControl appearance] setTitleTextAttributes:normaltextAttr 
                                               forState:UIControlStateNormal];
[[UISegmentedControl appearance] setTitleTextAttributes:selectedtextAttr 
                                               forState:UIControlStateSelected];

---

您使用了错误的键和值顺序，因此无法正常工作

试试这个

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor blackColor],UITextAttributeTextColor,
                                                         [UIColor clearColor], UITextAttributeTextShadowColor,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], UITextAttributeFont, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor colorWithRed:135.0/255.0 green:135.0/255.0 blue:135.0/255.0 alpha:1.0],UITextAttributeTextColor,
                                                         [UIColor clearColor], UITextAttributeTextShadowColor,
                                                         [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], UITextAttributeFont, nil] forState:UIControlStateSelected];

---

注意工厂方法（值/键）之间的配对顺序差异

以及文字声明（键/值）

您只是使用了错误的键和值顺序

这将有助于：

NSDictionary *normaltextAttr = 
       @{UITextAttributeTextColor : [UIColor blackColor],
         UITextAttributeTextShadowColor : [UIColor  clearColor],
         UITextAttributeFont : [UIFont fontWithName:_regularFont size:20.f]};


[[UISegmentedControl appearance] setTitleTextAttributes:normaltextAttr forState:UIControlStateNormal];

---

请注意，自iOS 7以来，这些密钥中的一些现已被弃用。现在，您需要使用以下内容：

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor blackColor], NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor colorWithRed: 135.0/255.0 green: 135.0/255.0 blue: 135.0/255.0 alpha: 1.0],NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateSelected];

---

字典文字工作良好；如果他们不这样做，iOS中就会有一个严重的bug<代码>[self-setTitleTextAttributes:@{UITextAttributeTextColor:[UIColor redColor]}用于状态：UIControlStateNormal]如果答案能指出问题所在，而不是仅仅发布一些有用的东西，那就太好了。

NSDictionary *normaltextAttr = 
       @{UITextAttributeTextColor : [UIColor blackColor],
         UITextAttributeTextShadowColor : [UIColor  clearColor],
         UITextAttributeFont : [UIFont fontWithName:_regularFont size:20.f]};


[[UISegmentedControl appearance] setTitleTextAttributes:normaltextAttr forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor blackColor], NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIColor colorWithRed: 135.0/255.0 green: 135.0/255.0 blue: 135.0/255.0 alpha: 1.0],NSForegroundColorAttributeName,
                                                         [UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0], NSFontAttributeName, nil] forState:UIControlStateSelected];